Test/Review of Efest IMR10440 V1 350mAh (Black)

HKJ

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[size=+3]Efest IMR10440 V1 350mAh (Black)[/size]


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Official specifications:
  • Brand /model: Efest IMR 10440 350mAh 3.7V
  • spec: LiMn 10440 350mAh 3.7V
  • Material: IMR(LiMn)

Efest%20IMR10440%20V1%20350mAh%20(Black)-info.png


Internal resistance is calculated from 1A to 2A.

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I got a pile of batteries in one envelope, not the best way to ship batteries, even when they are shrink wrapped. Efest have changed their packing.

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Efest%20IMR10440%20V1%20350mAh%20(Black)-Capacity.png


1A is handled very well, but even 3A is possible with these IMR cells.

Efest%20IMR10440%20V1%20350mAh%20(Black)-CapacityTimeHours.png


Efest%20IMR10440%20V1%20350mAh%20(Black)-CapacityTime.png


Efest%20IMR10440%20V1%20350mAh%20(Black)-Energy.png


Efest%20IMR10440%20V1%20350mAh%20(Black)-PowerLoadTime.png


Efest%20IMR10440%20V1%20350mAh%20(Black)-TripCurrent.png


Thse IMR batteries handles a high load for their size.

Efest%20IMR10440%20V1%20350mAh%20(Black)-Charge.png




[size=+3]Conclusion[/size]

These IMR batteries have very good performance at high loads, but the capacity is, of course, not that high.
At the current time I can only rate them acceptable, because Efest is a new company, and the batteries is not from one of the big brands.



[size=+3]Notes and links[/size]

How is the test done and how to read the charts
How is a protected LiIon battery constructed
More about button top and flat top batteries
Comparison to other LiIon batteries
 
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